"These astonishing science results are yet another example of Jupiter's curve balls and a testimony to the value of exploring the unknown from a new perspective with next-generation instruments," Scott Bolton, one of the principal scientists behind the Juno project, said in a release.

Composite images sent back by Juno's Jovian Infrared Auroral Mapper show these polar cyclones in stunning detail via infrared light.

The cyclonic winds Juno discovered extend deeper into the planet than any similar weather pattern on Earth — as far as 1,900 miles, or 3,000 kilometers, into Jupiter, constituting about 1% of its mass.

For comparison, Earth's atmosphere is less than one-millionth of its mass, according to Yohai Kaspi, an Israeli scientist who wrote a recent paper about Jupiter's weather published in Nature.

At Jupiter's north and south poles, the cyclones are so densely packed that they actually touch one another. But according to NASA, for reasons scientist cannot yet explain, the tightly clustered cyclones remain distinct.

Another paper in Nature based on Juno's data suggests that beneath this weather layer, the planet's core, made up of helium and hydrogen, rotates as a practically rigid body — a phenomenon that was also previously unknown to scientists.

"This is really an amazing result, and future measurements by Juno will help us understand how the transition works between the weather layer and the rigid body below," Tristan Guillot, a French scientist who helped write that paper, said in a statement. "Juno's discovery has implications for other worlds in our solar system and beyond."

This computer-generated image shows the structure of the cyclonic pattern observed over Jupiter's south pole. NASA/JPL-Caltech/SwRI/ASI/INAF/JIRAM Saturn, Jupiter's gaseous neighbor, has only single cyclonic systems at each pole.

"We are beginning to realize that not all gas giants are created equal," said Alberto Adriani, a scientist on the Juno project.

The $1 billion Juno mission, which NASA launched in 2011, is expected to continue to reveal more of Jupiter's secrets. Juno swings around the planet on an elliptical orbit about once every 53.5 days. The spacecraft made its 11th close pass, or perijove, on February 7.

"Juno is only about one-third the way through its primary mission, and already we are seeing the beginnings of a new Jupiter," Bolton said.